// Define LED pins
const int redLED = 13;
const int yellowLED = 12;
const int greenLED = 11;

void setup() {
  // Set LED pins as OUTPUT
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
}

void loop() {
  // Red light for 5 seconds
  digitalWrite(redLED, HIGH);
  delay(5000);
  digitalWrite(redLED, LOW);

  // Yellow light for 2 seconds
  digitalWrite(yellowLED, HIGH);
  delay(2000);
  digitalWrite(yellowLED, LOW);

  // Green light for 5 seconds
  digitalWrite(greenLED, HIGH);
  delay(5000);
  digitalWrite(greenLED, LOW);

  // Yellow light for 2 seconds (after green)
  digitalWrite(yellowLED, HIGH);
  delay(2000);
  digitalWrite(yellowLED, LOW);

  // Red light for 5 seconds (after yellow)
  digitalWrite(redLED, HIGH);
  delay(5000);
  digitalWrite(redLED, LOW);
}